They're likely both M buttons as earlier prototypes had these labeled as M1 and M2.

Best regards,
south

Probably undecided as to which M-mode setup works best which might explain the two buttons on the test car.

P.S.
Sat in a queue behind a new 535i and tried to imagine how the differing panels of the M5 would look and came to the conclusion that the M5 will be stunning looking, way better than even the M3 IMHO.

sexy rear lip spoiler.
this car looks ready!!!
unveil! now! Front and Rear bumpers
I've very interested in knowing if they will air scoops/vents on the hood. Would be cool, but traditionally, the m5 was supposed to be bad ass, yet disguised.

BEFORE YOU BUY YOUR NEXT BMW, PM ME FIRST WE CAN HOOK YOU UP!David Aviles: bmwdavid@icloud.com - Cell:202-262-2900
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Doubtful, remember that M Mode is customizable so BMW doesn't have to decide in favor of one setup.

Best regards,
south

You misunderstood what I meant by that, I did know the traditional M-mode offered the user the ability to pick from a different combinations but their button during testing probably served a different purpose.

These two buttons were their 'M' buttons to find possibly to best setup for the car. For example it might be two engine ECU throttle mappings.

Doubtful, remember that M Mode is customizable so BMW doesn't have to decide in favor of one setup.

south, do you think that the production car will offer two M buttons?

Quote:

Originally Posted by mapezzul

The two "M" buttons makes little sense unless there is an electric boost from one of them. The "M" button is programmable and key dependent so why would you need 2?

Same reason you have two seat memory buttons even though those are also programmable and key dependent. That is, to store and be able to quickly call up two different sets of settings or "profiles" if you will. It's actually a great idea for an enhanced MDrive feature, and I hope it makes it to production. This way you can have, for example, one for spirited street driving, and one for a true track setup. Or maybe one is for wife-and-kids mode with everything set to the most comfortable level, and one is with everything turned up to eleven. Or whatever else you want.

__________________

A gen-u-ine BMW eff-eight-zero with them tandem clutches in the transmission and that dad gum sun roof on the top-a da cawr.